Priming device



Apr. 3, 1923. 1,450,490

I E.T.CURRAN' PRIMING DEVICE Filed July 2, 1921 WVENTOQ .fbhgmdZfbnnay 26 X rme/va/ ed to be used in conjunction with motor ve- Patented Apr. 3, 1923.

entrain MSQAQt EDWARD T. CURB-AN, OF DETROIT, MICHIGAN.

PRIMING DEVICE.

Application filed July 2,

T 0 all whom it may concern:

Be it known that I, EDWARD T. CURRAN, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented a certain new and useful Improved Priming Device, of which the following is a specification.

This invention is a priming device adapthiclesto facilitatethe priming of the engine from time to time as occasion may require.

Priming devices of the general character under consideration have long been employed for the purpose stated. They are generally in the form. of a cup or reservoir provided with a threaded stem adapted to be screwedinto a tapped hole of the cylinder head. These cups are provided with a valve so that when water or gasoline is introduced into the cap its flow into the cylinder may be controlled. These priming cups work with entire satisfaction when the .engine is new or the cylinder perfectly clean.

However, after an engine has been run for a while carbon deposits accumulate at the inner end of the tapped hole of the cylinder head and in time effectually seal such hole and preclude the admission of the priming fluid into the cylinder. This disadvantage of the constructions long employed is well recognized by those familiar with motor operation and forms a source of continual annoyance and inconvenience. In the event the plugged hole of the cylinder head becomes clogged by carbon deposits, it is necessary to remove the priming cup and drive out. such deposits by means of a drift or other suitable implement, This requires loss of time, and, moreover, the carbon deposits freed from the cylinder wall fall into the cylinder, and becoming heated, result in pre-ignition. Flakes of this carbon are, moreover, apt to be caught in the valve seats and preclude proper seating of the valves, thereby resulting in missing of the associated cylinder.

ith the foregoing considerations in mind, the object of the present invention is to provide a priming device so constructed as to preclude the clogging of the passage from the cup into the cylinder, and in the preferred embodiment of the invention this result is accomplished by providing the valve with an elongated projection which extends to the interior of the cylinder and having its lower end substantially 1921. Serial No. 482,077.

fliish with the interior of the cylinder wall.

This projection serves to keep the passage free from clogging, or sealed against carbon deposits, so that, when the valve is unseated, the priming fluid may readily enter the cylinder, the invention however, is not restricted to this preferred construction.

Features of the invention, other than those specified, will be apparent from the.

following specifications and claims when read in conjunction with the accompanying drawings.

The accompanying drawings illustrate one practical embodiment of the invention, but the construction therein shown is to be understood as illustrative, only, and not as defining the limits of the invention.

Figure 1 shows a priming cup embodying the present invention, partly in. section and partly in elevation, the same being illustrated with a fragment of a cylinder block,

Figure 2 is a section of the line 2-2 in Fig. l and Figure 3 is a detailed section of the lower end of the valve member.

Referring to the drawings-'1 designates a cup provided with a threaded stem 2, adapted to be screwedinto the tapped hole 3, in cylinder head i, which is shown in the drawings as jacketed in the usual manner.

The stem 2 may, if desired, be formed integrally with the cup 1, but, for the purpose of illustration, is made threaded and screwed into the base of the cup. The stem 2 is of tubular form, and is provided, adjacent its.

lower end, with a constricted bore forminga valve seat 5, and the upper portion of stem 2, may be made polygonal, as indicated at '6,

to facilitate mounting of the cap on the engine.

Reference character WlllCll is shown as embodled in an enlargement on a rod 8, forming the. valve stem.

The upper end of the valve stem 8, is enlarged and threaded at 9, and extends through the hub 10 of a spider .11, seated in the top of the cup and held in place by pins 12. A suitable winged knob 13 is rigid with the upper end of the valve stem, and may be rotated manually to effect the travel of the same longitudinally through the hub 10 of the spider 11 for the purpose of lift. ing or depressing the valve 7, to seat or unseat the same. The members are shown in the full line position of which they par- 7 designates the valve take when the valve is seated, while the dotted line position shows the parts in unseated position.

Extending downwardly from the under side of the valve 7 is a projection 14, which, immediately adjacent the valve 7, is of relatively small cross section as shown at 15, so that, when the valve is unseated, sufficient space will be left interiorly of the seat to permit the priming fluid introduced into the cup 1 to flow down around the valve and into the engine cylinder. In practice the projection 14 is preferably made of such length that when the valve is seated the projection will extend to the point wherein its lower end will be substantially flush with the inner wall of the cylinder, although, if desired, it may be made slightly shorter or longer without departing from this invention. Moreover, the lower portion of the projection la is made of ample size so that even if the space within the tapped hole 3 about this projection becomes clogged with carbon, sufficient space will be left to permit the unrestricted flow o't' priming fluid into the cylinder.

Practice has demonstrated that when a priming device embodying the present in vention is employed the lower portion of the hole 3 may be filled with carbon deposits, and yet, when the valve is unseated, the projection 14 will leave a hole through this carbon deposit through which the primiIlg fluid may readily flow. The projection 14: is shown as cylindrical incross section, though if desired it may be of any other suitable cross section, in which event the lifting of the valve will cause the breaking away of the carbon deposits to a greater or lesser extent, so as to enlarge the opening through which the priming fluid may flow.

Itwill be understood that various modifications in structural detail may be made in the construction illustrated without departing from the spirit or substance of the invention, the scope of which is as broadly novel as is commensurate with the appended claims.

Having thus fully described the invention, what I claim as new and desire to secure by Letters Patent is:

1. A priming device embodying a receptacle provided with a threaded shank adapted to'extend for a portion of the distance through the priming passage of an associated engine cylinder, a duct leading from the base of the receptacle through the threaded shank to permit liquid to flow from the cup into the engine cylinder, a valve seat associated with said passage, a valve co operating with the valve seat, means fol-seating and unseating the valve, and means carried by the valve and adapted to extend into the passage beyond the end of the threaded shank for the purpose of precluding the clogging or such passage by carbon deposits.

2. A priming device embodying a cuplike receptacle adapted to receive and contain a priming liquid, a threaded shank associated with the receptacle and having a passage leading therethrough from the base of the receptacle to the end of the shank, a seat associated with said passage, a valve cooperating with the seat, a threaded valve stem fixed to the valve, a spider associated with the receptacle and which spider is provided with a threaded opening through which the valve stem extends, whereby the valve may be seated or unseated through rotation of its stem, and a projection carried by the valve and extending beyond the end of the shank substantially to the inner end of the tapped priming hole of an engine cylinder into which hole the shank of the receptacle is adapted to be screwed for a portion of the length of such hole, the projection serving to preclude the clogging of the hole by carbon deposits.

3. A priming device embodying a receptacle adapted to contain priming fluid and having a threaded shank adapted to screw into the tapped priming hole of an engine cylinder and extend for a part of the way through said hole, a threaded shank being provided with aduct leading from the base of the receptacle and having a constricted discharge outlet at the end of the shank, a valve adapted to seat at the constricted portion of the outlet, means for seating and unseating the valve, and a projection car ried by the valve and extending through the constricted outlet at all times, and being formed beyond the end of the shank with an enlarged portion extending substantially to the inner end of the priming hole of the cylinder, said enlarged portion being of a cross-sectional area greater than the crosssectional area of the constricted discharge outlet.

4. A priming device embodying a receptacle adapted to contain a priming fluid and provided with a tubular threaded shank, having at its end. a constricted outlet mouth, a valve adapted to seat at the constricted outlet mouth, means for seating and unseating the valve, and a. projection carried by the valve and extending beyond the valve so as to partake of a position beyond the end oi the shank, a portion of the projection beyond the end of the shank being of greater cross-sectional area than the cross-sectional area of the constricted outlet month.

In testimony whereof I have signed the foregoing specification.

EDWARD T. CURRAN. 

